"Jim Matheson has made a career out of distorting his record and taking politically convenient positions on issues," Scarpinato said.

Matheson voted against the health care bill when it was first debated and earlier this spring voted for its full repeal. He also voted in favor of a bill propping up real estate giants Fannie Mae and Freddie Mac, which the GOP committee calls a bailout. Matheson voted against the Wall Street and auto bailouts.

Matheson spokeswoman Alyson Heyrend said the letter "meticulously documents what we find erroneous" in the ad.

Outside groups have thrown millions of dollars at the 4th Congressional District race between Matheson and Republican Mia Love, one of the most closely watched in the country. Third-party political ads are made without candidates' input or consent of candidate, which federal law prohibits.

Love earlier complained about a House Majority PAC ad contending crime was "skyrocketing" in Saratoga Springs, where she serves as mayor. She said the ad was based on false information Matheson provided at a press conference.

Matheson has since admitted he made a mistake, though the ads continues to run.

Love sent a letter to supporters Wednesday telling them to expect negative attacks against her to continue until Election Day.

"We must take the high ground," Love wrote. "We don’t need heated arguments and negativity."